<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <div class="button">北京</div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div 
                        class="button-wrapper" 
                        v-for="item of hot" 
                        :key="item.id"
                        @click="handleCityClick(item.name)"
                    >
                        <div class="button">{{item.name}}</div>
                    </div>
                </div>
            <div class="area" 
                v-for="(item, key) of cities" 
                :key="key"
                :ref="key"
            >
            <!--里面的city是一个对象，不是数组 -->
            <!-- 列表栏 -->
                <div class="title border-topbottom">{{key}}</div>
                    <div class="item-list">
                        <div class="item border-bottom" 
                            v-for="innerItem of item"
                            :key="innerItem.id"
                            @click="handleCityClick(innerItem.name)"
                        > 
                            {{innerItem.name}}   
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState, mapMutations } from 'vuex'
export default {
    name: 'CityList',
    props:{
        hot: Array,
        cities: Object,
        letter: String
    },
    computed: {
        ...mapState({
            currentCity: 'city'
        })
    },
    methods:{
        handleCityClick (city) {
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapMutations(['changeCity'])
    },
    watch: {
        letter () {
            if(this.letter){
                const element = this.$refs[this.letter][0]
                this.scroll.scrollToElement(element)
            }
        }
    },
    mounted(){
        this.scroll = new Bscroll(this.$refs.wrapper);
    },
}
</script>

<style lang="stylus" scoped>
    @import '~styles/varibles.styl'
    .border-topbottom 
        &:before
            border-color: #777
        &:after
            border-color: #777
    .border-bottom
        &:before
            border-color: #777
    .list
        overflow: hidden
        position: absolute
        top: 1.58rem
        left: 0
        right: 0
        bottom: 0    
    .title
        line-height: .54rem
        background: #eee
        padding-left: .2rem
        color: #666
        font-size: .26rem
    .button-list
        overflow: hidden
        padding: .1rem .6rem .1rem .1rem
    .button-wrapper
        float: left
        width: 33.33%
    .button
        margin: .1rem
        padding: .1rem 0
        text-align: center
        border: .02rem solid #ccc
        border-radius: .06rem
    .item-list
    .item
        line-height: .76rem
        color: #666
        padding-left: .2rem     
</style>